I noticed that the suid mode was missing and set it with chmod u+s /usr/bin/su. Now the permissions are: $ ll $(which su) -rwsr-xr-x 1 root root 24120 May 24 2008 /bin/su And now su -l works for ordinary users. Thank you very much. I am certain that I have not been changing file modes in /usr/bin, ever. Does anyone have any idea how this change could occur? Where would a file mode change be logged, if at all? Thanks. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB at Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3